Valve.



No. 878,809. PATENTED FEB. 1l, 1908. W. J. LARNED.

VALVE.

APPL'IOYATION FILED SEPT.12, 1906.

WITNESSES.- '1N VENTOR ai@ A @p/'f ATTORNL y.

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WILLIAM J. LARNED, OF SYRACUSE, NEW YORKI VALVE.

Specification of Letters Patent. i

Patented Feb. 11, 1908.

Application filed September l2. 1906. Serial No. 334.204.

To all whom it may concern.'

Be it known that I, WILLIAM J. LAENED, a citizen of the United States, and resident of Syracuse, in the county of Onondaga, in theA State of New York, have invented new and useful Improvements in Valves, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This Vinvention has special reference to valves which are composed of mica, which material is preferred chiefly on account of its ability of resisting moisture, especially acids and heat. There is however considerable difliculty encountered in the use of valves composed of mica, owing to the liability of th'e mica face of the valve becoming iiaked and thus worn untrue and leaky, especially in cases where the valve encounters either a narrow, or sharp edged, or depressed and concaved seat.

v The object of this invention is to obviate such objections to the use of a valve composed of mica. And to that end the invention consists of a valve provided with a flat working face composed of mica, in combination with a correspondingly flat and broad valve-seat as hereinafter more fully def scribed.

In the laccompanying drawings Figure l isa face view of a valve embodying my invention; and Fig. 2 is a transverse' section of the same.

arepresents the valve and bits seat. The valve consists of a metal plate which is usually circular shaped. Said valve is provided with a Working face c which is composed of mica and firmly secured to the valve. Said working face is perfectly fiat as clearly shown in Fig. l.

I preferably provide the valve with an annular recess -dformed with concentric walls -e-e which are undercut on their inner sides to form the recess dovetail in cross-section as shown in Fig. 2 of the drawings. In the recess -clis placed a continuous ring -1'- composed of mica and thoroughly packed in the recess to cause the undercut walls e-cto pinch or grip the said ring, and thus securely retain it in the recess.

-fdenotes the valve-stem which is connected to the valve in the usual manner.

-grepresents the valve-cage which may be of any suitable shape and is provided with the valve-seat -bupon which the mica face #ris pressed when the valve is closed. Said valve-seat is broad and perfectly flat and parallel with the working'face -cof the valve, and thus obviates cutting, flaking and injury of the micaface -c-. Said mica is adaptedto conform itself to any slight defects or unevenness of the surface of the valve-seat and thus maintains a tight it to said seat, and dispenses with the labor of grinding the valve and its seat.

What I claim as my invention is 1d I A valve provided with a fiat working face composed of mica in combination with a correspondingly iiat and broad valve-seat substantially as set forth and shown.

WILLIAM J. LARNED.

Witnesses:

J. J. LAAss, E. LAAss. 

